Maybe some of you lore gurus can help me out. I had the theory, and people on Reddit as well, that Phyre is indeed in Fabien's body which would explain the modern hair. But then I rewatched the video and Phyre clearly talks about the mark on her hand and that she was covered in Thinblood vitae and not that she is in another body. So this theory is out, but maybe a Thinblood alchemy experiment failed. Anybody know anything about this?
It has to be Phyre's own body since Fabien is always a white male, meanwhile Phyre can be either a female or male of turkic origin.
Likely it was a plan by Fabien and a coterie of thinbloods to take revenge on fullbloods. In the dialogue transcript ripped from that one dev's monitor, you have Fabien say that they [thinbloods] take care of eachother unlike fullbloods. This is right after thinblood-allied ghouls storm some Camarilla holding. It seems like Fabien is part of their little terrorist group.
My speculation is that thinbloods intended to use their alchemy to weaken the sleeping elder, then have one of theirs inhabit the body and control the elder. Then use that elder to further their own goals. But something went wrong and the thinblood didn't manage to take control.